Abstract
Abstract Cosmic metals are widely believed to be produced by supernovae (SNe) and compact-object mergers. Here, we discuss the nucleosynthesis of neutrino-dominated accretion flows (NDAFs) with outflows in the centers of core-collapse SNe (CCSNe), and show that the outflows from NDAFs can have a significant contribution to the 56Ni abundances of faint explosions if the masses of the progenitor stars are within about 25–50 M ⊙. Less-massive progenitor stars can produce more 56Ni than their more-massive counterparts in the NDAF outflow nucleosynthesis channel. Therefore, we find that the total (i.e., CCSNe and NDAF outflows) 56Ni mass per CCSN depends only weakly upon the mass of the progenitor star. In terms of metallicity evolution, the ratio of 56Fe (produced by the decay of 56Ni) mass to the initial total gas mass can increase by ∼1.95 times if the upper limits of the nucleosynthesis yields from NDAF outflows and CCSNe are considered. Our results might have significant implications for the chemical evolution of the solar neighborhood, galaxies, and active galactic nuclei.
Highlights
Neutrino-dominated accretion flows (NDAFs) in the center of collapsars or compact object mergers are the plausible central engine of gamma-ray bursts (GRBs, for reviews, see, e.g., Liu et al 2017a; Zhang 2018)
We discuss the nucleosynthesis of neutrino-dominated accretion flows (NDAFs) with outflows in the core-collapse SNe (CCSNe), and show that the outflows from NDAFs can have a significant contribution to the 56Ni abundance in the faint explosions if the masses of the progenitor stars are within about 25−50 M⊙
We studied the NDAFs with outflows in the collapsar scenario and presented their contributions to the nucleosynthesis in scenes of the CCSNe and galaxies
Summary
Kohri et al 2005; Lee et al 2005; Gu et al 2006; Liu et al 2007; Janiuk et al 2007; Chen & Beloborodov 2007; Kawanaka & Mineshige 2007; Xue et al 2013). The initial mass supply rates can keep the accretion processes in the NDAF phase; the jets are possibly choked in the envelopes of the collapsars, especially for the low-metallicity massive progenitor stars. The neutrinos from NDAFs in the center of CCSNe with different mass, metallicity, and initial explosion energy should contribute the neutrino background (Wei & Liu 2021a). Strong outflows from the BH hyperaccretion systems should continuously inject and resupply gas into the envelope of collapsars, increase the accretion timescale and induce fluctuations in the accretion rates (Liu et al 2019) This mechanism can explain the unusually bright, long-lived iPTF14hls (e.g., Arcavi et al 2017) and some supernovae (SNe) with double-peak lightcurves (e.g., Mazzali et al 2008).
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